CN105465263A

CN105465263A - Vibration remover and circuit breaker

Info

Publication number: CN105465263A
Application number: CN201510934075.1A
Authority: CN
Inventors: 陈鸽
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-12-14
Filing date: 2015-12-14
Publication date: 2016-04-06

Abstract

The invention discloses a vibration remover and a circuit breaker. The vibration remover comprises a cylinder, a piston, a piston rod and a pressure relief device. One end of the piston rod penetrates a first end cover, stretches into the cylinder and is fixed with the piston in the cylinder. The cylinder is divided by the piston into a first chamber and a second chamber which are located on the side of the first end cover. The pressure relief device is assembled on the cylinder. A valve element rod of a pressure relief valve element arranged in the pressure relief device extends towards the first chamber. A telescopic rod is arranged in the pressure relief valve element. The pressure relief device is provided with an adjusting channel enabling the length of the stretching part of the telescopic rod to be conveniently adjusted. A limiting mechanism is arranged between the telescopic rod and the pressure relief valve element. The pressure relief device and the second chamber are communicated through a channel with an adjusting valve. The circuit breaker comprises a single-pole switch axially connected with the vibration remover. In the switch-on process, damping is relieved through the vibration remover at the stroke tail segment of a movable contact of the circuit breaker, the situation that damping force promotes switch-on bouncing of the movable contact is avoided, and switch-on time is shortened. The intensity of damping relieving is adjusted, the vibration remover and the circuit breaker synergistically act, and the switch-on performance is optimized.

Description

Vibration absorber and circuit breaker

Technical Field

The invention relates to a vibration absorber, in particular to a vibration absorber which releases damping at the end of a stroke and conveniently adjusts the pressure relief triggering stroke and the strength of damping release of the damping release, and a circuit breaker adopting the vibration absorber, belonging to the field of vibration absorbing and reducing equipment.

Background

At present, higher new requirements are continuously provided for the opening and closing performance of high-voltage and low-voltage mechanical switches, and the opening and closing time is required to be shorter without arcing. The moving contact of the vacuum bubble serving as the core component of the high-voltage and low-voltage mechanical switch has higher speed during switching-on and switching-off, does not bounce and discharge arc during switching-on, and does not bounce and discharge arc after switching-off. When the switch is switched on, the moving contact moving at high speed of the vacuum bubble collides with the fixed contact of the vacuum bubble, the moving contact is close to elastic collision, the moving contact moves in the reverse direction at the speed before the original collision, the moving contact bounces, the switch is switched on and switched off, larger electric impact is caused, and inrush current is generated. When the switch is opened, the moving contact of the vacuum bubble moves to the limit position of the switch, the speed is still high, the moving contact collides with the limiting part and rebounds, and when the distance between the moving contact and the fixed contact is too small, discharge is generated, namely arcing occurs. Inrush and arcing pose a significant hazard to switchgear and even the entire power grid.

At present, a measure generally adopted for solving the problem of the switching-on bounce of the moving contact is to add an energy storage device for storing the energy rebounded by the collision of the moving contact and preventing the switching-on bounce of the moving contact; the added shock absorber is mostly adopted to solve the problem of the rebound of the moving contact during the opening process and is used for storing the energy of the moving contact and preventing the rebound of the moving contact after the opening process. The measures improve the dynamic performance of the high-voltage and low-voltage mechanical switches in opening and closing to a great extent, but the damping force generated by the vibration absorber has the same direction with the closing bounce of the movable contact, and the movable contact can generate the closing bounce frequently during closing. Therefore, it is highly desirable to develop a shock absorber that generates damping stroke at the end of the damping stroke at the front stroke, the pressure release triggering stroke of the damping release is easily and directly adjusted, the strength of the damping release can be adjusted, and a circuit breaker incorporating the shock absorber, in which the shock absorber and the moving part incorporated in the circuit breaker cooperate to improve the switching performance.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a vibration absorber which generates damping at the front stroke and the rear stroke of the damping stroke to release the damping, and the pressure relief triggering stroke of the damping release and the strength of the damping release are both convenient to adjust. A pressure relief device is assembled on a cylinder body of the vibration absorber, a piston in the vibration absorber compresses a damping medium to generate damping at the front section of a stroke, and the piston impacts a pressure relief valve core of the pressure relief device at the tail section of the stroke to trigger the vibration absorber to relieve the pressure and the damping, so that the damping force of the vibration absorber is prevented from promoting a moving part connected with the vibration absorber to be decelerated, and the moving part rebounds at the tail end of the stroke. The opening degree of the adjusting valve is adjusted to adjust the strength of damping release, so that the vibration absorber and the moving part connected with the vibration absorber are in synergistic action, and the dynamic performance of the moving part is further optimized. The pressure relief device is provided with the adjusting channel, the extension length of a telescopic rod arranged in the pressure relief valve core can be directly adjusted to adjust the pressure relief triggering stroke of damping release, a first pressing plate of the pressure relief device does not need to be disassembled and assembled, and the adjusting operation is very convenient. A limiting mechanism is arranged between the telescopic rod and the pressure relief valve core, so that the telescopic rod is prevented from rotating relative to the pressure relief valve core along with the rotation of the screw rod, and the pressure relief trigger stroke of the pressure relief valve core is conveniently and accurately adjusted. The pressure relief device is assembled on the cylinder body of the vibration absorber, so that the installation and maintenance are easy, and the efficiency is improved.

The technical scheme of the invention is to provide a vibration absorber, which comprises a cylinder body 1, a piston 21 and a piston rod 22, wherein the cylinder body 1 comprises a first end cover 12, a cylinder barrel 11 and a second end cover 13 which are fixed in sequence, one end part of the piston rod 22 penetrates through the first end cover 12 and extends into the cylinder body 1, the piston 21 arranged in the cylinder body 1 is fixed, and the piston 21 divides an internal cavity of the cylinder body 1 into a first cavity at the side of the first end cover 12 and a second cavity at the side of the second end cover 13, and the vibration absorber is characterized in that: the pressure relief device 3 at least comprises a pressure relief cavity 35, a first pressure plate 33, a corrugated pipe 34, a return spring 32, a pressure relief valve core 31 and a valve core seat 36, wherein the pressure relief cavity 35 is arranged on the cylinder body 1, and the top end of the pressure relief cavity is opened by the bottom wall and the side wall; the pressure relief valve core 31 comprises a valve core part 311 and a valve core rod part 312, the valve core seat 36 is arranged on the inner side of the bottom wall of the pressure relief cavity 35 and is in sealing fit with the valve core part 311, and a valve seat hole 37 extending along the axial line direction of the valve core seat 36 is arranged on the bottom wall of the pressure relief cavity 35; the pressure relief valve core 31 is assembled in the valve core seat 36, the valve core rod part 312 extends into the valve seat hole 37, and the first pressure plate 33, the return spring 32 and the pressure relief valve core 31 are sequentially attached; the telescopic rod 313 and the screw 314 are arranged in the pressure relief valve core 31, the telescopic rod hole 3122 is arranged along the axial lead direction of the pressure relief valve core 31, the telescopic rod 313 is assembled in the telescopic rod hole 3122, and the outer surface of the telescopic rod 313 is in sealing fit with the corresponding inner surface of the telescopic rod hole 3122; the telescopic rod 313 is provided with a threaded blind hole matched with the external thread of the screw 314 along the axial lead direction of the telescopic rod, one end part of the screw 314 is assembled in the threaded blind hole, and the other end part of the screw 314 is connected with the pressure relief valve core 31; the middle part of the first pressure plate 33 is provided with an adjusting hole 38, the corrugated pipe 34 is arranged between the first pressure plate 33 and the pressure relief valve core 31, one end part of the corrugated pipe 34 is fixed with the pressure relief valve core 31 in a sealing way, the other end of the corrugated pipe is fixed with the first pressure plate 33 in a sealing way, and the first pressure plate 33 is fixed with the top end of the pressure relief cavity 35 in a sealing way; a first limiting mechanism 5 for preventing the telescopic rod 313 from rotating relative to the pressure relief valve core 31 is arranged between the telescopic rod 313 and the pressure relief valve core 31; the pressure relief device 3 is communicated with the second chamber through a channel 4, and an adjusting valve 6 for adjusting the damping release strength is arranged on the channel 4.

When in use, the cylinder body of the vibration absorber is fixed, and the piston rod is fixedly connected with a moving part needing buffering. The moving part drives the piston to move from the second end cover side to the first end cover side through the piston rod, the piston compresses damping media in the cylinder body to generate damping force, and the damping force promotes the moving part to decelerate. At the end of the stroke, the piston impacts a pressure relief valve core of a pressure relief device on the vibration absorber to trigger the vibration absorber to relieve pressure and damp, so that damping force is eliminated to promote the speed reduction of the moving part, the damping force is prevented from promoting the rebound of the moving part at the end point of the stroke, and the dynamic performance of the moving part is improved. The opening degree of the adjusting valve is adjusted to adjust the strength of damping release, so that the vibration absorber and the moving part connected with the vibration absorber are in synergistic action, and the dynamic performance of the moving part is further optimized. Through the regulation channel on the pressure relief device, the extension length of the telescopic rod arranged in the pressure relief valve core is directly adjusted, the pressure relief trigger stroke of damping release is regulated, the first pressing plate of the pressure relief device is not required to be disassembled and assembled, the regulation operation is very convenient, and the pressure relief trigger stroke matched with the moving part is convenient to debug and select. A limiting mechanism is arranged between the telescopic rod and the pressure relief valve core, so that the telescopic rod is prevented from rotating relative to the pressure relief valve core along with the rotation of the screw rod, and the pressure relief trigger stroke of the pressure relief valve core is conveniently and accurately adjusted. The pressure relief device is assembled on the cylinder body of the vibration absorber, so that the installation and the maintenance are easy, and the efficiency is improved.

The present invention also provides the following further preferred embodiments.

Preferably, the pressure relief valve core 31 further comprises a second pressure plate 315, a through hole is formed in the middle of the second pressure plate 315, an annular limiting step 3111, which is coaxial with the telescopic rod hole 3122 and located at the top end of the telescopic rod hole 3122, a protrusion 3143, which is circumferentially extended and matched with the limiting step 3111, is arranged on the outer surface of the other end of the screw 314, the protrusion 3143 is assembled on the limiting step 3111, the second pressure plate 315 covers the upper end of the protrusion 3143 and is fixed to the top of the pressure relief valve core 31, so that the other end of the screw 314 is connected with the pressure relief valve core 31; or,

the pressure relief valve core 31 further comprises a limiting pin 316, a limiting hole 317 for fixing the limiting pin is arranged in the pressure relief valve core 31, a limiting groove 3142 extending along the circumferential direction is arranged on the outer surface of the other end of the screw 314, one end of the limiting pin 316 is fixed in the limiting hole 317, and the other end of the limiting pin extends into the limiting groove 3142 and is in sliding fit with the limiting groove 3142, so that the other end of the screw 314 is connected with the pressure relief valve core 31.

Preferably, the first limiting mechanism 5 comprises a first protrusion 51 and a first sliding groove 52 which are matched with each other, the first sliding groove 52 is arranged on the outer surface of the telescopic rod 313 and extends along the axial lead direction of the telescopic rod, the first protrusion 51 is arranged on the pressure relief valve core 31 and protrudes out of the inner surface of the telescopic rod hole 3122, and corresponds to the first sliding groove 52; or,

the first limiting mechanism 5 includes a first protrusion 51 and a first sliding groove 52, which are engaged with each other, the first sliding groove 52 is disposed on the inner surface of the telescopic rod hole 3122 of the pressure relief valve core 31 and extends along the axial line direction thereof, and the first protrusion 51 is disposed on the telescopic rod 313 and protrudes from the outer surface thereof, and corresponds to the first sliding groove 52.

Preferably, a second limit mechanism 7 for preventing the rotation of the relief valve 31 with respect to the cylinder 1 is provided between the relief valve 31 and the cylinder 1.

Preferably, the second limiting mechanism 7 includes a second protrusion 71 and a second sliding groove 72, which are matched with each other, the second sliding groove 72 is disposed on the outer surface of the pressure relief valve core 31 and extends along the axial direction thereof, the second protrusion 71 is disposed on the cylinder 1 and protrudes from the inner surface of the pressure relief cavity 35 or the valve seat hole 37, and corresponds to the second sliding groove 72; or,

the second limiting mechanism 7 includes a second protrusion 71 and a second sliding groove 72, which are engaged with each other, the second sliding groove 72 is disposed on an inner surface of the pressure relief cavity 35 or the valve seat hole 37 of the cylinder 1 and extends along an axial direction thereof, and the second protrusion 71 is disposed on the pressure relief valve core 31 and protrudes from an outer surface thereof, and corresponds to the second sliding groove 72.

Preferably, the pressure relief device 3 is mounted on the cylinder wall of the cylinder 11 of the cylinder 1 and located on the first end cap 12 side, and the portion of the telescopic rod 313 embedded in the pressure relief valve core 31 extending into the cylinder 1 is in a spherical crown shape, an inclined plane shape or a cam shape;

the channel 4 comprises a second channel 42 which is arranged in the cylinder wall of the cylinder 11 and is in sealed communication with the pressure relief device 3, and a third channel 43 which is arranged in the cylinder wall of the cylinder 11 and is positioned at the side of the second end cover 13 and is in sealed communication with the second chamber, wherein the second channel 42, the regulating valve 6 and the third channel 43 are in sealed communication; or,

the channel 4 comprises a first channel 41 which is fixed on the first pressure plate 33 of the pressure relief device 3 and is in sealed communication with the pressure relief device 3, a second channel 42 which is arranged outside the cylinder body 1, and a third channel 43 which is arranged in the cylinder wall of the cylinder 11 and is positioned on the side of the second end cover 13 and is in sealed communication with the second chamber, wherein the first channel 41, the second channel 42, the regulating valve 6 and the third channel 43 are in sealed communication.

Preferably, the pressure relief device 3 is mounted on the first end cover 12 of the cylinder 1;

the channel 4 comprises a first channel 41 which is arranged in the first end cover 12 and is in sealed communication with the pressure relief device 3, a second channel 42 which is arranged in the cylinder wall of the cylinder 11 or outside the cylinder 1, and a third channel 43 which is arranged in the cylinder wall of the cylinder 11 and is positioned on the side of the second end cover 13 and is in sealed communication with the second chamber, wherein the first channel 41, the regulating valve 6, the second channel 42 and the third channel 43 are in sealed communication.

Preferably, a guide groove 3121 extending along the axial direction is provided on the outer circumferential surface of the spool rod portion 312 of the relief spool 31.

When in use, the cylinder body of the vibration absorber is fixed, and the piston rod is fixedly connected with a moving part needing buffering. The moving part drives the piston to move from the second end cover side to the first end cover side through the piston rod, the piston compresses a damping medium in the cylinder body to generate a damping force, the damping force is rapidly enhanced along with the acceleration of the moving speed of the piston, and meanwhile, the moving part is promoted to decelerate. The compressed damping medium stores energy and flows from the high pressure side to the low pressure side, i.e. from the first chamber to the second chamber, through the damping orifice in the piston, releasing part of the stored energy and damping the generated damping force. In the end of the stroke, the movement speed of the piston is very high relative to that in the previous stage, higher energy is stored in the compressed damping medium, the generated damping force is larger, and the acceleration effect on the deceleration of the moving part is stronger. When the piston moves to a pressure relief triggering stroke for releasing the damping, namely the end part of a telescopic rod arranged in the pressure relief valve core, the piston impacts the telescopic rod of the pressure relief valve core to trigger the pressure relief device to release the pressure, a damping medium flows out through the pressure relief device to release stored energy, the damping force of the vibration absorber is released, the damping force is eliminated, the motion resistance of a motion part is removed, and the motion part moves to a stroke end point at a higher speed; when the moving part moves to the stroke end point, the energy stored in the damping medium in the vibration absorber is eliminated, the damping force is relieved, the moving part cannot rebound, and the dynamic performance of the moving part is improved. The opening degree of the adjusting valve is adjusted to adjust the strength of damping release, so that the vibration absorber and the moving part connected with the vibration absorber are in synergistic action, and the dynamic performance of the moving part is favorable for further optimization. Through the regulation passageway that sets up on the pressure relief device, need not dismouting pressure relief device's first clamp plate, the extension length of the built-in telescopic link of direct adjustment pressure release case adjusts the pressure release trigger stroke that the damping was relieved, and it is very convenient to adjust the operation, adjusts efficiently, conveniently debugs the pressure release trigger stroke of selecting with moving part looks adaptation, optimizes the dynamic behavior of moving part. In addition, a first limiting mechanism is arranged between the telescopic rod and the pressure relief valve core, so that the telescopic rod and the pressure relief valve core can be prevented from rotating relatively when the pressure relief triggering stroke is adjusted by the knob screw; a second limiting mechanism is arranged between the pressure relief valve core and the cylinder body, and the pressure relief valve core and the cylinder body can be prevented from rotating relatively when the pressure relief triggering stroke of the pressure relief valve core is adjusted by the knob screw. Through setting up foretell first, second stop gear, when the turn knob screw rod adjusted the pressure release of pressure release case and triggered the stroke, can avoid the telescopic link to rotate along with the rotation of screw rod to adjust the pressure release of pressure release case and trigger the stroke accurately, it is more convenient to adjust the operation. The pressure relief device is assembled on the cylinder body of the vibration absorber, so that the pressure relief valve core is convenient to replace, the maintenance is convenient in daily use, and the efficiency is higher.

Another object of the present invention is to provide a circuit breaker with the above-mentioned shock absorber, wherein the shock absorber and the moving part of the circuit breaker for switching on and off cooperate with each other to shorten the switching on time, reduce the switching on bounce and improve the switching on and off performance of the circuit breaker.

The invention also provides a breaker, which comprises the absorber and is characterized in that: the circuit breaker further comprises at least one single-stage switch 9, wherein the single-stage switch 9 comprises a vacuum bubble 91, an insulating cylinder 92 and an electromagnetic driver 93, and the vacuum bubble 91, the insulating cylinder 92, the electromagnetic driver 93 and the absorber 94 are axially and fixedly connected.

The embedded energy storage device 95 of insulation cylinder 92, energy storage device 95 includes cylinder 951, piston 952, piston rod 953 and spring 954, cylinder 951 is including sealed fixed top end cap 9511, cylinder 9512 and bottom end cap 9513 in proper order, piston rod 953 passes the top end cap 9511 of cylinder 951 and stretches into in the cylinder 951 and fixed mutually with the piston 952 that sets up in cylinder 951, sets up the overflow hole on the piston 952, and spring 954 sets up between the bottom end cap 9513 and the piston 952 of cylinder 951.

The circuit breaker and the absorber are matched for use, and the absorber is axially and fixedly connected with a moving part of the circuit breaker for switching on and off. The cylinder body of the vibration absorber is provided with a pressure relief device, and a pressure relief valve core which is used for triggering pressure relief and extends into the cylinder body of the vibration absorber is arranged in the pressure relief device. Before the breaker is closed, a piston arranged in the shock absorber moves at a high speed, a damping medium in a cylinder body is compressed to generate damping force, when the piston moves to a pressure release triggering stroke for releasing the damping, namely the end part of a telescopic rod arranged in a pressure release valve core, the piston impacts the telescopic rod of the pressure release valve core to trigger a pressure release device to release the pressure, the damping force of the shock absorber is released, the damping force which is opposite to the moving direction of a moving contact of the breaker and the same as the closing and bouncing direction of the moving contact is eliminated, the closing and bouncing of the moving contact promoted by the damping force are reduced, and meanwhile, the moving contact is enabled to keep. Therefore, the damping force is released before the circuit breaker is closed, the bounce of the moving contact of the vacuum bubble during the closing can be reduced, the moving contact can be closed at a higher speed, the closing time is further shortened, and the closing performance of the circuit breaker is improved. The opening degree of the regulating valve is regulated to regulate the strength of damping release, so that the moving parts of the vibration absorber and the circuit breaker and the energy storage device are cooperated, the dynamic performance of the moving parts is improved, the closing bounce of the circuit breaker is reduced, and the closing performance of the circuit breaker is further optimized. The extension length of a telescopic rod arranged in a pressure relief valve core is adjusted through an adjusting channel on the pressure relief device to adjust the pressure relief trigger stroke for releasing the damping, a first pressing plate of the pressure relief device is not required to be disassembled and assembled, and the adjustment operation is very convenient; the pressure relief trigger stroke matched with the moving part of the circuit breaker is convenient to debug and select, and the dynamic performance of the moving part of the circuit breaker is optimized. Set up first, second stop gear respectively between pressure relief device's telescopic link and pressure relief valve core and between pressure relief valve core and the cylinder body, can't produce relative rotation between telescopic link, pressure relief valve core and the cylinder body, the telescopic link does not rotate along with the rotation of screw rod, and the convenient accurate pressure relief that adjusts pressure relief valve core triggers the stroke, has improved regulation efficiency and precision. The pressure relief device is assembled on the cylinder body of the vibration absorber, and when the pressure relief device is installed and maintained, if the pressure relief valve core is replaced, the vibration absorber does not need to be disassembled, only the first pressing plate of the pressure relief device needs to be disassembled, so that the operation is simple and convenient, and the maintenance is more efficient and more convenient.

Advantageous effects

The damping force of the vibration absorber is relieved at the end of the stroke, rebound of a moving part connected with the vibration absorber is not promoted, the pressure relief device is arranged on the vibration absorber, a piston of the vibration absorber compresses a damping medium at the front section of the stroke to generate damping, when the piston moves to the pressure relief triggering stroke at the end of the stroke, the piston collides with a pressure relief valve core of the pressure relief device to trigger the pressure relief device to relieve the pressure, the damping force of the vibration absorber is relieved, the damping force promoting the speed reduction of the moving part is eliminated, the moving part moves at a high speed, and the situation that the damping force of the vibration absorber causes the reverse bounce of the moving part at the end of the stroke is avoided.

The strength of the damping release can be adjusted, and the strength of the damping release is adjusted by arranging an adjusting valve on the channel, adjusting the opening of the adjusting valve and controlling the flow of the damping medium flowing channel, so that the vibration absorber and the moving part connected with the vibration absorber can act in a synergistic manner, and the dynamic performance of the moving part is further optimized.

The pressure relief triggering stroke of the pressure relief valve core can be adjusted, a screw rod in threaded fit with the telescopic rod is arranged in the pressure relief valve core, the extension length of the telescopic rod of the pressure relief valve core is adjusted by turning the screw rod, the pressure relief triggering stroke of the pressure relief valve core is adjusted, and the pressure relief valve core with different pressure relief triggering strokes does not need to be replaced.

The pressure relief trigger stroke is convenient to adjust, the adjusting channel is arranged on the pressure relief device, the adjusting tool stretches into the adjusting channel, the extension length of a telescopic rod arranged in the pressure relief valve core is adjusted by using an adjusting tool knob screw rod, the pressure relief trigger stroke for releasing damping is adjusted, the first pressing plate of the pressure relief device does not need to be disassembled and assembled, and the adjusting operation is very convenient.

The pressure relief triggering stroke is convenient to adjust accurately, the first limiting mechanism and the second limiting mechanism are respectively arranged between the telescopic rod and the pressure relief valve core and between the pressure relief valve core and the cylinder body, relative rotation cannot be generated among the telescopic rod, the pressure relief valve core and the cylinder body, and the pressure relief triggering stroke of the pressure relief valve core can be accurately adjusted through the knob screw.

The pressure relief device is convenient to install, debug and maintain, and when the pressure relief device is installed and maintained by assembling the pressure relief device on the cylinder body of the vibration absorber, if the pressure relief valve core is replaced, the vibration absorber does not need to be disassembled, only the first pressing plate of the pressure relief device needs to be disassembled, and the operation is very simple and convenient.

The invention has the advantages that the closing performance of the breaker is improved, the vibration absorber is axially connected with the moving part of the breaker for switching on and off, before the breaker is closed, the piston arranged in the vibration absorber collides with the pressure relief valve core of the pressure relief device to trigger the pressure relief device to relieve pressure, the damping force of the vibration absorber is relieved, the damping force which is opposite to the moving direction of the moving contact and has the same direction with the closing bounce direction of the moving contact is eliminated, the closing bounce of the moving contact promoted by the damping force is reduced, meanwhile, the moving contact keeps higher closing speed, and the closing time is further shortened. The adjusting tool penetrates through an adjusting channel on the pressure relief device and directly turns a screw rod arranged in the pressure relief valve core to adjust the extension length of a telescopic rod of the pressure relief valve core, the pressure relief trigger stroke matched with a moving part of the circuit breaker is debugged and selected, the switching-on bounce of the moving contact is reduced, and the switching-on time is shortened. The opening degree of the regulating valve is regulated to regulate the strength of damping release, so that the dynamic performance of the moving part is improved under the synergistic action of the vibration absorber, the moving part of the circuit breaker and the energy storage device, the switching-on bounce of the circuit breaker is reduced, and the switching-on performance of the circuit breaker is further optimized. And limiting mechanisms are respectively arranged between the telescopic rod and the pressure relief valve core and between the pressure relief valve core and the cylinder body, so that the telescopic rod, the pressure relief valve core and the cylinder body cannot rotate relatively, and the pressure relief triggering stroke of the pressure relief valve core can be accurately adjusted.

Drawings

Fig. 1 is a schematic view of a construction of a shock absorber of the present invention with a pressure relief device mounted on an end cap.

Figure 2 is a schematic view of another construction of the inventive absorber with a pressure relief device mounted on the end cap.

Fig. 3 is a schematic view of a construction of a vibration absorber according to the invention with a pressure relief device mounted on the cylinder wall.

Fig. 4 is an exploded, enlarged schematic view of a pressure relief device.

Fig. 5 is an enlarged view of one configuration of the pressure relief valve cartridge.

FIG. 6 is an exploded, enlarged schematic view of the pressure relief valve cartridge.

Fig. 7 is an enlarged schematic view of region a in fig. 1.

Fig. 8 is an enlarged schematic view of region B in fig. 2.

Fig. 9 is a schematic diagram of a circuit breaker according to the present invention.

In the figure, 1-cylinder, 2-piston mechanism, 3-pressure relief device, 4-channel, 5-first limit mechanism, 6-adjusting valve, 7-second limit mechanism, 9-single-stage switch, 11-cylinder, 12-first end cover, 13-second end cover, 14-gland, 15-first sealing ring, 16-second sealing ring, 21-piston, 22-piston rod, 23-damping hole, 24-third sealing ring, 25-fourth sealing ring, 31-pressure relief valve core, 32-reset spring, 33-first pressure plate, 34-bellows, 35-pressure relief cavity, 36-valve core seat, 37-valve seat hole, 51-first lug, 52-first chute, 71-second lug, 72-second chute, 311-valve core part, 312-valve core rod part, 313-telescopic rod, 314-screw rod, 315-second pressure plate, 316-limiting pin, 317-limiting hole, 3111-limiting step, 3121-guide groove, 3122-telescopic rod hole, 3142-limiting groove, 3143-bulge, 91-vacuum bubble, 92-insulating cylinder, 93-electromagnetic driver, 94-vibration absorber, 95-energy storage device, 951-cylinder body, 952-piston, 953-piston rod, 954-spring, 9511-top end cover, 9512-cylinder barrel and 9513-bottom end cover.

Detailed Description

In order to clarify the technical solution and technical object of the present invention, the present invention will be further described with reference to the accompanying drawings and the detailed description.

Embodiment mode 1

A vibration absorber of the present invention, as shown in fig. 1, includes a cylinder 1, a piston mechanism 2, a pressure relief device 3, a passage 4, and a regulator valve 6. The cylinder body 1 comprises a first end cover 12, a cylinder barrel 11 and a second end cover 13, wherein the first end cover 12 is fixed at the top end of the cylinder barrel 1 in a sealing manner, and further, the first end cover 12 and the cylinder barrel 1 are integrally formed; the second end cover 13 is fixed at the bottom end of the cylinder barrel 1 by bolts, and the second end cover 13 and the bottom end of the cylinder barrel 1 are sealed by a first sealing ring 15. The piston mechanism 2 includes a piston 21 and a piston rod 22. The piston 21 is disposed inside the cylinder 1, and a space between a side surface of the piston 21 and an inner surface of the cylinder 11 is sealed by a fourth seal ring 25, so that the piston 21 is slidable in the axial direction with respect to the cylinder 11. The piston 21 divides the internal chamber of the cylinder 1 into a first chamber on the upper first end cap 12 side and a second chamber on the lower second end cap 13 side. The piston 21 is provided with a damping hole 23 for communicating the first chamber and the second chamber, and the area of the damping hole 23 is not more than 1% of the area of the piston 21, preferably 0.8%. The damping hole is used for adjusting the buffering characteristic of the vibration absorber, the area of the damping hole is small, and the buffering damping is large; the area is large, and the buffer damping is small; and designing a damping hole with a proper sectional area according to the buffering requirement. The lower end part of the piston rod 22 penetrates through a through hole in the middle of the first end cover 12 and extends into the cylinder body 1, and is fixed with the piston 21, and the piston rod 22 and the piston 21 are sealed through a third sealing ring 24; the piston rod 22 and the through hole in the middle of the first end cover 12 are sealed through the step on the through hole, the first sealing ring 16 and the gland 14; the piston rod 22 is slidable in the axial direction relative to the through hole in the middle of the first end cap 12. The pressure relief device 3 is assembled on the first end cover 12 of the cylinder 1, a pressure relief valve core 31 is arranged in the pressure relief device 3, and a valve core rod part 312 arranged in the pressure relief valve core 31 extends towards the first cavity of the cylinder 1. The passage 4 is used for communicating the pressure relief device 3 with the second chamber, and the regulating valve 6 is arranged on the passage 4.

As shown in fig. 4 and fig. 1, the pressure relief device 3 includes a pressure relief cavity 35, a first pressure plate 33, a return spring 32, a bellows 34, a pressure relief valve core 31, and a valve core seat 36. The pressure relief chamber 35 is provided in the first end cap 12 and is formed by a bottom wall and a side wall, and is open at the top end, i.e., at the upper end face of the first end cap 12. The valve core seat 36 is arranged on the inner side of the bottom wall of the pressure relief chamber 35, i.e. on the side facing away from the first chamber. A valve seat hole 37 extending in the axial direction of the valve seat 36 is provided in the bottom wall of the relief chamber 35, the valve seat hole 37 is a through hole penetrating the first chamber, and the valve body rod 312 of the relief valve body 31 can penetrate therethrough. The pressure relief valve core 31 includes a valve core portion 311 and a valve core rod portion 312, which are fixed in sequence, and the valve core rod portion 312 extends downward from the lower end surface of the valve core portion 311 along the axial direction of the valve core portion 311. The valve core portion 311 and the valve core seat 36 are in sealing fit, and may be sealed by a sealing ring, and a sealing surface of the valve core portion 311 and the valve core seat 36 in sealing fit is a conical surface, as shown in fig. 2, or a flat surface or a spherical surface, as shown in fig. 1. The pressure relief valve spool 31 is fitted in the valve spool seat 36, and the spool rod portion 312 passes through the valve seat hole 37 and protrudes out of the valve seat hole 37, i.e., out of the lower end face of the first end cap 12, into the first chamber, and is directly opposite to the upper end face of the piston 21. The first pressure plate 33, the return spring 32 and the pressure relief valve core 31 are sequentially attached. The first pressure plate 33 is fixed to the top opening of the pressure relief cavity 35, that is, fixed to the upper end surface of the first end cover 12 by bolts, and further, the first pressure plate 33 is in sealing fit with the top opening of the pressure relief cavity 35. The outer surface of the spool rod 312 of the pressure relief spool 31 is provided with a flow guide groove 3121 extending along the axial direction thereof, as shown in fig. 5 to 7, when pressure is relieved, the flow of the damping medium is facilitated, and the pressure is relieved rapidly.

As shown in fig. 5, 6 and 7, the pressure relief valve core 31 further includes an expansion rod 313, a screw 314 and a second pressure plate 315. An expansion rod hole 3122 is provided in the pressure relief valve core 31, and the expansion rod hole 3122 extends downward along the axial direction of the pressure relief valve core 31 and penetrates the valve core rod portion 312. The telescopic rod 313 is assembled in the telescopic rod hole 3122, the outer surface of the telescopic rod 313 is in sealing fit with the corresponding inner surface of the telescopic rod hole 3122, and can be sealed by a sealing ring, and the telescopic rod 313 can slide along the axial lead direction of the telescopic rod 313 relative to the telescopic rod hole 3122. The telescopic rod 313 is provided with a blind threaded hole extending from the top end surface thereof to the free end thereof in the axial direction thereof, and the end portion of the screw 314 provided with the external thread is inserted into the blind threaded hole and the external thread of the end portion is engaged with the internal thread of the blind threaded hole. The middle of the second pressing plate 315 is provided with a through hole. The top of the pressure relief valve core 31 is provided with an annular limiting step 3111 which is located at the top end of the telescopic rod hole 3122 and extends along the circumferential direction of the inner surface of the telescopic rod hole 3122, the inner diameter of the limiting step 3111 is larger than that of the telescopic rod hole 3122, and the limiting step 3111 and the telescopic rod hole 3122 are coaxial. The outer surface of the other end of the screw 314 is provided with a protrusion 3143 extending along the circumferential direction, the protrusion 3143 surrounds the screw 314 for a circle, and the protrusion 3143 is matched with the limit step 3111. The protrusion 3143 at the other end of the screw 314 is assembled on the limit step 3111, the second pressing plate 315 is disposed above the protrusion 3143 and attached to the protrusion 3143, the second pressing plate 315 and the top end surface of the relief valve core 31 are fixed by bolts, that is, the screw 314 and the relief valve core 31 are connected, and the screw 314 can rotate relative to the relief valve core 31. The end surface of the other end of the screw 314 is exposed from the through hole in the middle of the second pressing plate 315, and a straight groove or a cross-shaped groove matched with the blade of the screwdriver or a groove or a protrusion matched with a special adjusting tool is arranged on the end surface.

The middle part of the first pressure plate 33 is provided with an adjusting hole 38, the bellows 34 is arranged between the first pressure plate 33 and the pressure relief valve core 31, one end part of the bellows 34 is fixed with the pressure relief valve core 31 in a sealing way, the other end part of the bellows 34 is fixed with the first pressure plate 33 in a sealing way, the pressure relief valve core 31, the bellows 34 and the first pressure plate 33 form an adjusting channel isolated from the inner space of the pressure relief device 3, and the other end part of the screw 314 is positioned in the adjusting channel. The screwdriver or the special adjusting tool stretches into the adjusting channel, the screwdriver or the special adjusting tool is used for twisting the screw rod to adjust the extension length of the telescopic rod arranged in the pressure relief valve core, the pressure relief triggering stroke of the pressure relief valve core is adjusted, the first pressing plate does not need to be disassembled and assembled, the adjusting operation is very convenient, and the debugging efficiency is higher.

The other end of the screw 314 and the relief valve body 31 have another connection method as follows. As shown in fig. 8, the relief valve core 31 further includes a stopper pin 316 and a stopper hole 317. The pressure relief valve core 31 is internally provided with a limiting hole 317 for fixing a limiting pin, the limiting hole 317 is arranged along the radial direction of the pressure relief valve core 31, and the inner surface of the limiting hole 317 is provided with internal threads. An external thread is arranged at one end of the limit pin 316, and the external thread of the limit pin 316 is matched with the internal thread of the limit hole 317. The outer surface of the other end of the screw 314 is provided with a limit groove 3142 extending along the circumferential direction, and the limit groove 3142 surrounds the outer surface of the screw 314 for a circle. One end of the limiting pin 316 is fixed in the limiting hole 317, and the other end of the limiting pin extends into the limiting groove 3142 and is matched with the limiting groove 3142, so that the screw 314 is connected with the pressure relief valve core 31. The screw 314 is rotatable relative to the relief spool 31.

When the turn-knob screw rod is used for adjusting the pressure relief triggering stroke of the pressure relief valve core, relative rotation can be generated between the telescopic rod and the pressure relief valve core and between the pressure relief valve core and the cylinder body frequently, in order to accurately adjust the pressure relief triggering stroke of the pressure relief valve core, the first pressing plate needs to be detached, the pressure relief valve core is taken out from the pressure relief cavity, then the turn-knob screw rod is used for adjusting the pressure relief triggering stroke, the operation is very inconvenient, and the adjusting efficiency is influenced. In order to avoid the problems, the invention arranges a first limit mechanism 5 which prevents the telescopic rod 313 from rotating relative to the pressure relief valve core 31 between the telescopic rod 313 and the pressure relief valve core 31, and can prevent the telescopic rod from rotating relative to the pressure relief valve core along with the rotation of the screw rod when the screw rod is turned to adjust the pressure relief triggering stroke. A second limiting mechanism 7 for preventing the pressure relief valve core 31 from rotating relative to the cylinder body 1 is arranged between the pressure relief valve core 31 and the cylinder body 1, and the pressure relief valve core can be prevented from rotating relative to the cylinder body along with the rotation of the screw rod when the pressure relief triggering stroke is adjusted by the knob screw rod. Through setting up foretell first, second stop gear, can't produce relative rotation between telescopic link, pressure release case and cylinder body, the telescopic link does not rotate along with the rotation of screw rod, under the condition of not taking out pressure release case, conveniently adjusts pressure release trigger stroke of pressure release case accurately, and is very convenient, has improved regulation efficiency and precision.

As shown in fig. 5, the first limiting mechanism 5 includes a first protrusion 51 and a first sliding groove 52, which are matched with each other. The first sliding groove 52 is provided on the outer surface of the expansion link 313, extends along the axial line direction of the expansion link 313, and is located at the other end of the sealing engagement portion between the expansion link 313 and the expansion link hole 3122, and as shown in fig. 5, the first sliding groove 52 is located at the upper end of the expansion link 313, that is, at a sealing engagement portion located below the relief valve spool 31 between the expansion link 313 and the expansion link hole 3122. The relief valve core 31 is provided with first fixing holes for fixing the first bump 51, the first fixing holes are distributed along the radial direction of the relief valve core 31, and the first fixing holes are positioned below the upper end part of the relief valve core 31 corresponding to the first sliding groove 52 and correspond to the first sliding groove 52. One end of the first protrusion 51 is fixed in the first fixing hole of the pressure relief valve spool 31, and the other end protrudes from the inner surface of the telescopic rod hole 3122, extends into the first sliding groove 52, is engaged with the first sliding groove 52, and can slide relative to the first sliding groove 52. The first protrusion 51 and the relief valve core 31 may be integrally formed. In the first stopper mechanism 5 according to another embodiment, as shown in fig. 7, the first slide groove 52 is provided on the inner surface of the telescopic rod hole 3122 of the relief valve body 31, extends in the axial direction of the relief valve body 31, and is located at the upper end portion of the relief valve body 31, which is different from the seal engagement portion located below the relief valve body 31 between the telescopic rod 313 and the telescopic rod hole 3122. The telescopic rod 313 is provided with first fixing holes for fixing the first projection 51, the first fixing holes are distributed along the radial direction of the telescopic rod 313, and the first fixing holes are positioned above one end part of the telescopic rod 313 corresponding to the first sliding slot 52 and correspond to the first sliding slot 52, namely, the upper end of the part of the telescopic rod 313 corresponding to the first sliding slot 52 is shown in fig. 7. One end of the first protrusion 51 is fixed in the first fixing hole of the telescopic rod 313, and the other end protrudes out of the outer surface of the telescopic rod 313, and extends into the first sliding slot 52, and is matched with the first sliding slot 52, so as to be capable of sliding relative to the first sliding slot 52. The first protrusion 51 and the expansion link 313 may also be integrally formed.

As shown in fig. 8, the second limiting mechanism 7 includes a second protrusion 71 and a second sliding groove 72 that are engaged with each other. The second sliding groove 72 is provided on the inner surface of the pressure release chamber 35 of the cylinder block 1, and extends in the axial direction of the pressure release chamber 35. A second fixing hole for fixing the second bump 71 is formed in the spool portion 311 of the relief spool 31, the second fixing hole is distributed along the radial direction of the relief spool 31, and the second fixing hole corresponds to the second sliding groove 72. One end of the second protrusion 71 is fixed in the second fixing hole, and the other end protrudes from the side surface of the valve core 311, and extends into the second sliding slot 72, and is matched with the second sliding slot 72, so as to be capable of sliding relative to the second sliding slot 72. The second protrusion 71 and the valve body 311 may be integrally formed. The second limiting mechanism 7 may also be disposed such that the second sliding groove 72 is disposed on a side surface of the spool portion 311 of the pressure relief spool 31 and extends along an axial line of the pressure relief spool 31, and the cylinder 1 is provided with a second fixing hole penetrating through the pressure relief cavity 35.

In yet another embodiment of the second limiting mechanism 7, as shown in fig. 7, the second sliding groove 72 is provided on an outer surface of the spool rod portion 312 of the relief spool 31 and extends in an axial direction of the relief spool 31. Second fixing holes for fixing the second protrusions 71 are formed in the inner wall of the valve seat hole 37, the second fixing holes are distributed in the radial direction of the valve seat hole 37, and the second fixing holes correspond to the second sliding grooves 72. One end of the second protrusion 71 is fixed in the second fixing hole, and the other end protrudes from the inner surface of the valve seat hole 37, extends into the second sliding groove 72, and is engaged with the second sliding groove 72 to be slidable relative to the second sliding groove 72. Here, the second projection 71 and the inner wall of the valve seat hole 37 may be integrally formed. The second limiting mechanism 7 may also be disposed such that the second sliding groove 72 is disposed on the inner wall of the valve seat hole 37 and extends along the axial line of the valve seat hole 37, and the spool rod portion 312 of the pressure relief spool 31 is provided with second fixing holes, which are distributed along the radial direction of the pressure relief spool 31.

Wherein, the channel 4, as shown in fig. 1, includes a first channel 41, a second channel 42 and a third channel 43. The first channel 41 is arranged in the first end cover 12, is in sealed communication with the pressure relief cavity 35 of the pressure relief device, and is distributed along the radial direction of the first end cover 12; the second channel 42 is arranged in the cylinder barrel wall of the cylinder barrel 11 and distributed along the axial lead direction of the cylinder barrel 11; the third channel 43 is arranged in the cylinder wall of the cylinder 11 and on the side of the second end cap 13 and in sealed communication with the second chamber, distributed in the radial direction of the cylinder 11. The first channel 41, the regulating valve 6, the second channel 42 and the third channel 43 are sequentially communicated in a sealing manner, and the regulating valve 6 can also be arranged between the second channel 42 and the third channel 43. The passage 4 is communicated with the pressure relief cavity 35 and the second cavity of the pressure relief device 3, when the pressure relief is relieved, the damping medium in the first cavity of the cylinder body 1 flows out of the pressure relief device and flows back to the second cavity of the cylinder body 1 through the passage 4, the total amount of the damping medium in the cylinder body 1 is kept unchanged, the vibration absorber can continuously work, the damping medium does not need to be injected frequently, the maintenance workload is reduced, and the cost can also be reduced.

The working principle of the vibration absorber of the invention is as follows: the screwdriver or the special adjusting tool penetrates through the adjusting channel, the screwdriver or the special adjusting wrench is used for twisting the screw on the pressure relief valve core, the extension length of the telescopic rod arranged in the pressure relief valve core is adjusted, the length of the telescopic rod extending into the vibration absorber cylinder body is changed, and the pressure relief triggering stroke of the pressure relief valve core, namely the distance from the end part of the telescopic rod to the lower end face of the first end cover, is adjusted. The opening of the regulating valve is adjusted to control the flow of the damping medium circulation channel, so as to regulate the strength of damping release. When the piston 21 moves from the second end cover 13 side to the first end cover 12 side, the piston 21 compresses the damping medium to generate damping. The compressed damping medium stores energy and flows from the high pressure side to the low pressure side, i.e. from the first chamber to the second chamber, through the damping orifice 23 in the piston, releasing part of the stored energy and damping the generated damping force. The piston 21 moves to the end part of the telescopic rod 313 arranged in the pressure relief valve core 31, namely, the pressure relief triggering stroke, the piston 21 collides with the telescopic rod 313 to push the pressure relief valve core 31 to be far away from the valve core seat 36, the pressure relief device 3 is triggered to relieve pressure, the damping medium flows out through the pressure relief device 3 and flows back to the second chamber through the channel 4, the energy stored in the damping medium is released, and the damping force of the vibration absorber is relieved. Namely, the vibration absorber of the invention generates damping at the front section of the stroke and releases the damping at the tail section of the stroke, thereby avoiding the rebound of the moving parts connected with the vibration absorber of the invention at the end point of the stroke.

Embodiment mode 2

Embodiment 2 differs from embodiment 1 only in that: as shown in fig. 2, the channel 4 includes a first channel 41, a second channel 42, and a third channel 43. The first channel 41 is arranged in the first end cover 12, is in sealed communication with the pressure relief cavity 35 of the pressure relief device, and is distributed along the radial direction of the first end cover 12; the second channel 42 is arranged outside the cylinder body 1 and distributed along the axial lead direction of the cylinder barrel 11; the third channel 43 is arranged in the cylinder wall of the cylinder 11 and is located on the side of the second end cover 13 and is in sealed communication with the second chamber, and is distributed along the radial direction of the cylinder 11. The first passage 41, the second passage 42 and the third passage 43 are sequentially in sealed communication, and the regulating valve 6 is arranged on the second passage 42 and is in sealed communication with the second passage 42.

Embodiment 3

Embodiment 3 differs from embodiment 1 only in that: as shown in fig. 3, the pressure relief device 3 is fitted to the upper end portion of the cylinder wall of the cylinder 11, i.e., on the first end cap 12 side. The pressure relief chamber 35 of the pressure relief device 3 is arranged at the upper end of the cylinder wall of the cylinder 11 and is formed by a bottom wall and side walls, which are open at the top end, i.e. at the outer end of the cylinder 11, where the top and bottom, which determine the spatial orientation of the pressure relief device 3 with respect to the axial direction of the pressure relief device 3, are pointed, the direction away from the absorber being the top. The end of the spool rod portion of the relief spool 31 is located inside the valve seat hole 37, i.e., the end of the spool rod portion does not protrude from the inner surface of the cylinder 11. The part of the telescopic rod 313 arranged in the pressure relief valve core 31, which extends into the cylinder body 1, is in a spherical crown shape, and can also be in an inclined plane shape or a cam shape, so that the pressure relief valve core can be conveniently extruded by the side wall surface of the piston, and the side wall surface of the piston cannot be collided and damaged. As shown in fig. 3, the channel 4 includes a second channel 42 and a third channel 43. The second channel 42 is arranged in the cylinder wall of the cylinder 11, is communicated with the pressure relief cavity 35 in a sealing way, and is distributed along the axial lead direction of the cylinder 11; the third channel 43 is arranged in the cylinder wall of the cylinder 11, is positioned at the side of the second end cover 13, is in sealed communication with the second chamber, and is distributed along the radial direction of the cylinder 11; the second passage 42, the regulating valve 6 and the third passage 43 are sequentially communicated in a sealing way. And (3) turning a screw rod on the pressure relief valve core, adjusting the extension length of a telescopic rod arranged in the pressure relief valve core, and changing the protruding position of the spherical crown-shaped, inclined plane-shaped or cam-shaped end part of the telescopic rod on the inner surface of the cylinder barrel 11 on the upper end face side of the piston to realize the adjustment of the pressure relief trigger stroke, wherein the pressure relief trigger stroke refers to the distance from the protruding position to the lower end face of the first end cover. The end of the telescopic rod at the protruding position is smoothly transited to the inner surface of the cylinder 11 so as to facilitate the side of the piston to extrude the end of the telescopic rod. When the piston 21 moves from the second end cover 13 side to the first end cover 12 side, the piston 21 compresses the damping medium to generate damping, the piston 21 moves to the end portion of the telescopic rod 313 in the pressure relief valve core 31, namely, at the pressure relief triggering stroke, the side wall surface of the piston 21 presses the end portion of the telescopic rod 313 to push the pressure relief valve core 31 away from the valve core seat 36, the pressure relief device 3 is triggered to relieve pressure, and the damping force of the shock absorber is relieved. The vibration absorber of the invention generates damping at the front section of the stroke and releases the damping at the tail section of the stroke, thereby avoiding the rebound of the moving parts connected with the vibration absorber of the invention at the end point of the stroke.

In yet another layout of the channels 4 (not shown), the channels 4 include a first channel 41, a second channel 42 and a third channel 43. The first channel 41 is fixed on the first pressure plate 33, is in sealed communication with the pressure relief cavity 35, is positioned outside the cylinder body 1, and is distributed along the radial direction of the cylinder barrel 11; the second channel 42 is arranged outside the cylinder body 1 and distributed along the axial lead direction of the cylinder barrel 11; the third channel 43 is arranged in the cylinder wall of the cylinder 11 and is located on the side of the second end cover 13 and is in sealed communication with the second chamber, and is distributed along the radial direction of the cylinder 11. The first passage 41, the second passage 42 and the third passage 43 are sequentially in sealed communication, and the regulating valve 6 is arranged on the second passage 42 and is in sealed communication with the second passage 42.

The pressure relief device 3 is assembled on the cylinder wall of the cylinder 11 of the vibration absorber, so that the vibration absorber does not need to be detached from a connected moving part when the pressure relief valve core is installed, maintained and replaced, the operation is very simple and convenient, and the maintenance efficiency is higher.

In use, the cylinder of the vibration absorber of each of the above embodiments is fixed, and the piston rod is fixedly connected to a moving member to be damped. The moving part drives the piston to move from the second end cover side to the first end cover side through the piston rod, the piston compresses a damping medium in the cylinder body to generate a damping force, the damping force is rapidly enhanced along with the acceleration of the moving speed of the piston, and meanwhile, the moving part is promoted to decelerate. The compressed damping medium stores energy and flows from the high pressure side to the low pressure side, i.e. from the first chamber to the second chamber, through the damping orifice in the piston, releasing part of the stored energy and damping the generated damping force. In the end of the stroke, the movement speed of the piston is very high relative to that in the previous stage, higher energy is stored in the compressed damping medium, the generated damping force is larger, and the acceleration effect on the deceleration of the moving part is stronger. When the piston moves to a pressure relief triggering stroke for releasing the damping, namely the end part of a telescopic rod arranged in a pressure relief valve core, the piston impacts or extrudes the end part of the telescopic rod to push the pressure relief valve core to be away from a valve core seat, a pressure relief device is triggered to release the pressure, a damping medium flows out through the pressure relief device to release stored energy, the damping force of the vibration absorber is released, the damping force for promoting the speed reduction of a moving part is removed, and the moving part moves towards the stroke end point at a high speed; when the moving part moves to the stroke end point, the energy stored in the damping medium in the vibration absorber is eliminated, the damping force is eliminated, the moving part can not be rebounded, and the dynamic performance of the moving part is favorably improved. The opening degree of the adjusting valve is adjusted to adjust the strength of damping release, so that the vibration absorber and the moving part connected with the vibration absorber can cooperate to further optimize the dynamic performance of the moving part. The middle part of pressure relief device's first clamp plate is equipped with the regulation hole, and the bellows sets up between first clamp plate and pressure release case, and one end and the pressure release case of bellows are sealed fixed, and another tip and first clamp plate are sealed fixed, pressure release case, bellows and first clamp plate have constituted the regulation passageway isolated with pressure relief device's inner space, and the regulation passageway is through adjusting hole and exterior space intercommunication, another tip of screw rod be in the regulation passageway. One end of a screwdriver or a special adjusting tool penetrates through the adjusting channel and reaches the end of a screw rod arranged in the pressure relief valve core; the screw rod on the screwdriver or a special adjusting plate is used for twisting the pressure relief valve core to adjust the extension length of a telescopic rod arranged in the pressure relief valve core, the pressure relief triggering stroke of the pressure relief valve core is adjusted, the first pressing plate does not need to be disassembled and assembled, and the adjusting operation is very convenient. And the pressure relief trigger stroke matched with the moving part is convenient to debug and select, and the dynamic performance of the moving part is further optimized. In addition, a first limiting mechanism is arranged between the telescopic rod and the pressure relief valve core, so that the telescopic rod can be prevented from rotating relative to the pressure relief valve core along with the rotation of the screw rod when the screw rod is turned to adjust the pressure relief triggering stroke; a second limiting mechanism is arranged between the pressure relief valve core and the cylinder body, and the pressure relief valve core can be prevented from rotating relative to the cylinder body along with the rotation of the screw rod when the pressure relief triggering stroke is adjusted by the knob screw rod. Through setting up foretell first, second stop gear, unable relative rotation that produces between telescopic link, pressure release case and cylinder body, when the pressure release that the screw rod was adjusted the pressure release and is triggered the stroke, telescopic link, pressure release case and cylinder body homogeneous phase are static relatively, have avoided the telescopic link to rotate along with the rotation of screw rod, and the pressure release case rotates along with the rotation of telescopic link, conveniently adjusts the pressure release of pressure release case and triggers the stroke accurately, makes and adjusts the easy operation. The pressure relief device is communicated with the second cavity through the channel, when the pressure relief is used for relieving the damping, the damping medium in the first cavity of the absorber cylinder body flows out of the pressure relief device and flows back to the second cavity of the absorber cylinder body through the channel, the total amount of the damping medium in the absorber cylinder body is kept unchanged, the absorber can continuously work, the damping medium does not need to be injected frequently, the maintenance workload is reduced, and the cost can be reduced. The pressure relief device is assembled on the cylinder body of the vibration absorber, the pressure relief valve core is convenient to replace and the pressure relief trigger stroke of the pressure relief valve core is convenient to adjust, the vibration absorber does not need to be disassembled, even the vibration absorber does not need to be disassembled from connected moving parts, only the first pressing plate of the pressure relief device needs to be disassembled, and the operation is very simple and convenient.

Embodiment 4

As shown in fig. 9, the circuit breaker according to the present invention includes three single-pole switches 9 and a control circuit. The control circuit is the prior art, is not a protection technical point of the invention, and is not detailed here; the three single-pole switches 9 are identical in structural configuration and will not be described separately, and one of the single-pole switches will be described below. The single-pole switch 9 comprises a vacuum bulb 91, an insulating cylinder 92 and an electromagnetic driver 93, wherein the vacuum bulb 91, the insulating cylinder 92, the electromagnetic driver 93 and a vibration absorber 94 of the invention are axially connected and fixed. The insulating cylinder 92 is internally provided with an energy storage device 95, and the energy storage device 95 comprises a cylinder 951, a spring 954, a piston 952 and a piston rod 953 which are arranged in the insulating cylinder 92. The cylinder 951 of the insulating cylinder 92 is a closed body composed of a bottom end cover 9513, a cylinder barrel 9512 and a top end cover 9511, the lower end of the cylinder barrel 9512 is fixed on the side of the bottom end cover 9513, and further, the cylinder barrel 9512 and the bottom end cover 9513 are integrally formed, so that the processing and the manufacturing are convenient; the top end cap 9511 covers the top end of the cylinder 9512 and is in sealing engagement with the top end face. The piston 952 is arranged in the cylinder 951, the side surface of the piston 952 is in sliding and sealing fit with the inner surface of the cylinder 9512, one end part of the piston rod 953 passes through a through hole in the middle of the top end cover 9511 and extends into the cylinder 951 and is fixed with the piston 952 arranged in the cylinder 951, the piston rod 953 is in sealing fit with the piston 952, and the piston rod 953 is in sliding and sealing fit with the through hole in the middle of the top end cover 9511; the spring 954 is disposed between a bottom end cap 9513 of a cylinder 951 and a piston 952, and attached to each other. The cylinder 951 of the insulating cylinder 92 is filled with damping oil, and may be filled with damping gas or other damping medium. The leading-out shaft of the moving contact of the vacuum bubble 91 is fixed with the piston rod of the energy storage device 95 embedded in the insulating cylinder 92, the lower end shaft of the insulating cylinder 92 is fixed with one end shaft of the electromagnetic driver 93, the other end shaft of the electromagnetic driver 93 is fixed with the piston rod of the vibration absorber of the invention, and the cylinder body of the vibration absorber is fixed with the frame of the circuit breaker. The leading-out shaft of the moving contact of the vacuum bubble 91, the insulating cylinder 92 and the end shaft of the electromagnetic driver 93 form the moving part of the circuit breaker.

In the prior art, the moving contact of the vacuum bubble of the high-voltage and low-voltage circuit breakers adopting the energy storage device and the vibration absorber technology often generates the problem of moving contact bounce when the moving contact is switched on or switched off, particularly switched on. The damping device mainly comprises a damping device, a piston, a damping medium, a breaker, a damping device, a damping medium, a damping device and a power supply, wherein the damping device is arranged in the damping device; just before closing the door at the end of the stroke, the movement speed of the piston is very high relative to that of the piston at the previous stage, and the generated damping force is very large. The direction of the damping force is opposite to the moving direction of the moving contact, so that the damping force has stronger deceleration effect on the moving contact and can increase the closing time; the direction of the damping force is the same as the direction of the closing bounce of the moving contact, the moving contact can be promoted to move reversely when the breaker is closed, the closing bounce of the moving contact is induced, and the closing performance of the breaker is influenced. Therefore, the adoption of the vibration absorber can improve the opening performance of the circuit breaker, but can reduce the closing performance of the circuit breaker.

The circuit breaker and the absorber are matched for use, and the absorber is axially and fixedly connected with a moving part of the circuit breaker for switching on and off. The cylinder body of the vibration absorber is provided with a pressure relief device, a pressure relief valve core used for triggering pressure relief is arranged in the pressure relief device, and a telescopic rod arranged in the pressure relief valve core extends into the cylinder body of the vibration absorber. When the breaker is switched on, a piston arranged in the shock absorber moves at a high speed, when the piston moves to a pressure release triggering stroke for releasing the damping, namely the end part of a telescopic rod arranged in a pressure release valve core, the piston impacts the telescopic rod to trigger a pressure release device to release the pressure, the damping force of the shock absorber is released, the damping force opposite to the moving direction of a moving contact of the breaker is eliminated, and the moving contact is enabled to maintain a high speed to move towards a stroke end point quickly; the damping force in the same direction as the closing bounce of the moving contact is eliminated, and the closing bounce of the moving contact promoted by the damping force can be reduced. Therefore, the damping force is released before the breaker is closed, the bounce of the moving contact of the vacuum bubble during the closing can be reduced, the moving contact can be closed at a higher speed, the closing time is further shortened, and the closing performance of the breaker is improved. The opening degree of the regulating valve is regulated to regulate the strength of damping release, so that the moving parts of the vibration absorber and the circuit breaker and the energy storage device are cooperated, the dynamic performance of the moving parts of the circuit breaker is improved, the closing time is shortened, the closing bounce of the moving contact is reduced, and the closing performance of the circuit breaker is further optimized. One end of a screwdriver or a special adjusting tool penetrates through an adjusting channel on the pressure relief device to reach the end part of a screw rod arranged in the pressure relief valve core, the screw rod arranged in the pressure relief valve core is directly turned and twisted by the screwdriver or a special adjusting wrench to adjust the pressure relief triggering stroke of the pressure relief valve core, the first pressing plate of the pressure relief device is not required to be disassembled and assembled, the pressure relief triggering stroke matched with the conveying part of the breaker can be quickly adjusted and selected, the moving contact of the vacuum bubble can reach the required closing speed, the closing time is shortened, and the closing performance is improved. The first limiting mechanism and the second limiting mechanism are respectively arranged between the telescopic rod and the pressure relief valve core of the pressure relief device and between the pressure relief valve core and the cylinder body, relative rotation cannot be generated among the telescopic rod, the pressure relief valve core and the cylinder body, the telescopic rod does not rotate along with the rotation of the screw rod, the pressure relief triggering stroke of the pressure relief valve core is conveniently and accurately adjusted, and the adjusting efficiency and the adjusting precision are improved. Pressure relief device assembles on the cylinder body of vibration absorber, when carrying out installation maintenance to pressure relief device, if change the pressure release case, need not disassemble the vibration absorber, need not tear the vibration absorber off from the circuit breaker even, only needs dismouting pressure relief device's first clamp plate, and is easy and simple to handle, maintains more high-efficient, more convenient. In addition, the invention is beneficial to improving the debugging efficiency of the mechanical switch, shortening the debugging period and reducing the development cost.

The present invention is more advanced than the prior art as follows.

1) The damping force of the vibration absorber is relieved at the end of the stroke, rebound of a moving part connected with the vibration absorber is not promoted, the pressure relief device is arranged on the vibration absorber, a piston of the vibration absorber compresses a damping medium at the front section of the stroke to generate damping, when the piston moves to the pressure relief triggering stroke at the end of the stroke, the piston collides with a pressure relief valve core of the pressure relief device to trigger the pressure relief device to relieve the pressure, the damping force of the vibration absorber is relieved, the damping force promoting the speed reduction of the moving part is eliminated, the moving part moves at a high speed, and the situation that the damping force of the vibration absorber causes the reverse bounce of the moving part at the end of the stroke is avoided.

2) The strength of the damping release can be adjusted, and the strength of the damping release is adjusted by arranging an adjusting valve on the channel, adjusting the opening of the adjusting valve and controlling the flow of the damping medium flowing channel, so that the vibration absorber and the moving part connected with the vibration absorber can act in a synergistic manner, and the dynamic performance of the moving part is further optimized.

3) The pressure relief triggering stroke of the pressure relief valve core can be adjusted, a screw rod in threaded fit with the telescopic rod is arranged in the pressure relief valve core, the extension length of the telescopic rod of the pressure relief valve core is adjusted by turning the screw rod, the pressure relief triggering stroke of the pressure relief valve core is adjusted, and the pressure relief valve core with different pressure relief triggering strokes does not need to be replaced.

4) The pressure relief triggering stroke is convenient to adjust, an adjusting channel is arranged on the pressure relief device, one end of an adjusting tool penetrates through the adjusting channel to reach the end of a screw rod on the pressure relief valve core, the screw rod is directly turned to adjust the extension length of a telescopic rod arranged in the pressure relief valve core, the pressure relief triggering stroke with the released damping is adjusted, a first pressing plate of the pressure relief device does not need to be disassembled and assembled, and the adjusting operation is very convenient.

5) The pressure relief triggering stroke is convenient to adjust accurately, the first limiting mechanism and the second limiting mechanism are respectively arranged between the telescopic rod and the pressure relief valve core and between the pressure relief valve core and the cylinder body, relative rotation cannot be generated among the telescopic rod, the pressure relief valve core and the cylinder body, and the pressure relief triggering stroke of the pressure relief valve core can be accurately adjusted through the knob screw.

6) The pressure relief device is convenient to install, debug and maintain, and when the pressure relief device is installed and maintained by assembling the pressure relief device on the cylinder body of the vibration absorber, if the pressure relief valve core is replaced, the vibration absorber does not need to be disassembled, only the first pressing plate of the pressure relief device needs to be disassembled, and the operation is very simple and convenient.

7) The invention has the advantages that the closing performance of the breaker is improved, the vibration absorber is axially connected with the moving part of the breaker for switching on and off, before the breaker is closed, the piston arranged in the vibration absorber collides with the pressure relief valve core of the pressure relief device to trigger the pressure relief device to relieve pressure, the damping force of the vibration absorber is relieved, the damping force which is opposite to the moving direction of the moving contact and has the same direction with the closing bounce direction of the moving contact is eliminated, the closing bounce of the moving contact promoted by the damping force is reduced, meanwhile, the moving contact keeps higher closing speed, and the closing time is further shortened. The adjusting tool penetrates through an adjusting channel on the pressure relief device and directly turns a screw rod arranged in the pressure relief valve core to adjust the extension length of a telescopic rod of the pressure relief valve core, the pressure relief trigger stroke matched with a moving part of the circuit breaker is debugged and selected, the switching-on bounce of the moving contact is reduced, and the switching-on time is shortened. The opening degree of the regulating valve is regulated to regulate the strength of damping release, so that the dynamic performance of the moving part is improved under the synergistic action of the vibration absorber, the moving part of the circuit breaker and the energy storage device, the switching-on bounce of the circuit breaker is reduced, and the switching-on performance of the circuit breaker is further optimized. And limiting mechanisms are respectively arranged between the telescopic rod and the pressure relief valve core and between the pressure relief valve core and the cylinder body, so that the telescopic rod, the pressure relief valve core and the cylinder body cannot rotate relatively, and the pressure relief triggering stroke of the pressure relief valve core can be accurately adjusted.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the foregoing description only for the purpose of illustrating the principles of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims, specification, and equivalents thereof.

Claims

1. The utility model provides a vibration absorber, includes cylinder body (1), piston (21) and piston rod (22), cylinder body (1) is including fixed first end cover (12), cylinder (11) and second end cover (13) in proper order, the tip of piston rod (22) runs through first end cover (12) and stretches into inside cylinder body (1), and sets up in cylinder body (1) piston (21) are fixed mutually, piston (21) separate the inside cavity of cylinder body (1) into the first cavity that is located first end cover (12) side and the second cavity that is located second end cover (13) side, its characterized in that: the pressure relief device (3) at least comprises a pressure relief cavity (35), a first pressure plate (33), a corrugated pipe (34), a return spring (32), a pressure relief valve core (31) and a valve core seat (36), wherein the pressure relief cavity (35) is arranged on the cylinder body (1) and is provided with a top end opening formed by a bottom wall and a side wall; the pressure relief valve core (31) comprises a valve core part (311) and a valve core rod part (312), the valve core seat (36) is arranged on the inner side of the bottom wall of the pressure relief cavity (35) and is in sealing fit with the valve core part (311), and a valve seat hole (37) extending along the axial line direction of the valve core seat (36) is arranged on the bottom wall of the pressure relief cavity (35); the pressure relief valve core (31) is assembled in the valve core seat (36), the valve core rod part (312) extends into the valve seat hole (37), and the first pressure plate (33), the reset spring (32) and the pressure relief valve core (31) are sequentially attached; an expansion rod (313) and a screw rod (314) are arranged in the pressure relief valve core (31), an expansion rod hole (3122) is formed in the pressure relief valve core (31) along the axial lead direction of the pressure relief valve core, the expansion rod (313) is assembled in the expansion rod hole (3122), and the outer surface of the expansion rod (313) is in sealing fit with the corresponding inner surface of the expansion rod hole (3122); the telescopic rod (313) is provided with a threaded blind hole matched with the external thread of the screw rod (314) along the axial lead direction of the telescopic rod, one end part of the screw rod (314) is assembled in the threaded blind hole, and the other end part of the screw rod is connected with the pressure relief valve core (31); the middle part of the first pressure plate (33) is provided with an adjusting hole (38), the corrugated pipe (34) is arranged between the first pressure plate (33) and the pressure relief valve core (31), one end part of the corrugated pipe (34) is hermetically fixed with the pressure relief valve core (31), the other end of the corrugated pipe is hermetically fixed with the first pressure plate (33), and the first pressure plate (33) is hermetically fixed with the top end of the pressure relief cavity (35); a first limiting mechanism (5) for preventing the telescopic rod (313) from rotating relative to the pressure relief valve core (31) is arranged between the telescopic rod (313) and the pressure relief valve core (31); the pressure relief device (3) is communicated with the second chamber through a channel (4), and an adjusting valve (6) for adjusting the damping release strength is arranged on the channel (4).

2. A vibration absorber as claimed in claim 1, wherein:

the pressure relief valve core 31 further comprises a second pressure plate (315) with a through hole in the middle, the top of the pressure relief valve core (31) is provided with an annular limiting step (3111) which is coaxial with the telescopic rod hole (3122) and is positioned at the top end of the telescopic rod hole (3122), the outer surface of the other end of the screw rod (314) is provided with a protrusion (3143) which extends along the circumferential direction and is matched with the limiting step (3111), the protrusion (3143) is assembled on the limiting step (3111), the second pressure plate (315) covers the upper end of the protrusion (3143) and is fixed with the top end of the pressure relief valve core (31), and the other end of the screw rod (314) is connected with the pressure relief valve core (31); or,

the pressure relief valve core (31) further comprises a limiting pin (316), a limiting hole (317) used for fixing the limiting pin is formed in the pressure relief valve core (31), a limiting groove (3142) extending along the circumferential direction is formed in the outer surface of the other end of the screw rod (314), one end of the limiting pin (316) is fixed in the limiting hole (317), the other end of the limiting pin extends into the limiting groove (3142) and is in sliding fit with the limiting groove (3142), and the other end of the screw rod (314) is connected with the pressure relief valve core (31).

3. A vibration absorber as claimed in claim 2, wherein:

the first limiting mechanism (5) comprises a first bump (51) and a first sliding groove (52) which are matched with each other, the first sliding groove (52) is arranged on the outer surface of the telescopic rod (313) and extends along the axial lead direction of the telescopic rod, and the first bump (51) is arranged on the pressure relief valve core (31), protrudes out of the inner surface of the telescopic rod hole (3122), and corresponds to the first sliding groove (52); or,

the first limiting mechanism (5) comprises a first bump (51) and a first sliding groove (52) which are matched with each other, the first sliding groove (52) is arranged on the inner surface of a telescopic rod hole (3122) of the pressure relief valve core (31) and extends along the axial lead direction of the telescopic rod hole, and the first bump (51) is arranged on the telescopic rod (313), protrudes out of the outer surface of the telescopic rod hole and corresponds to the first sliding groove (52).

4. A vibration absorber as claimed in claim 1, wherein: and a second limiting mechanism (7) for preventing the pressure relief valve core (31) from rotating relative to the cylinder body (1) is arranged between the pressure relief valve core (31) and the cylinder body (1).

5. A second spacing mechanism according to claim 4, wherein:

the second limiting mechanism (7) comprises a second bump (71) and a second sliding groove (72) which are matched, the second sliding groove (72) is arranged on the outer surface of the pressure relief valve core (31) and extends along the axial lead direction of the pressure relief valve core, and the second bump (71) is arranged on the cylinder body (1), protrudes out of the inner surface of the pressure relief cavity (35) or the valve seat hole (37), and corresponds to the second sliding groove (72); or,

the second limiting mechanism (7) comprises a second bump (71) and a second sliding groove (72) which are matched, the second sliding groove (72) is arranged on the inner surface of a pressure relief cavity (35) or a valve seat hole (37) of the cylinder body (1) and extends along the axial lead direction of the inner surface, and the second bump (71) is arranged on the pressure relief valve core (31), protrudes out of the outer surface of the pressure relief valve core, and corresponds to the second sliding groove (72).

6. A vibration absorber as claimed in claim 2, wherein:

the pressure relief device (3) is assembled on the cylinder wall of the cylinder (11) of the cylinder body (1) and is positioned on one side of the first end cover (12), and the part of the telescopic rod (313) which is arranged in the pressure relief valve core (31) and extends into the cylinder body (1) is in a spherical crown shape, an inclined plane shape or a cam shape;

the channel (4) comprises a second channel (42) which is arranged in the cylinder wall of the cylinder (11) and is in sealed communication with the pressure relief device (3), and a third channel (43) which is arranged in the cylinder wall of the cylinder (11) and is positioned on the side of the second end cover (13) and is in sealed communication with the second chamber, wherein the second channel (42), the regulating valve (6) and the third channel (43) are in sealed communication; or,

the passage (4) comprises a first passage (41) which is fixed on a first pressure plate (33) of the pressure relief device (3) and is in sealed communication with the pressure relief device (3), a second passage (42) which is arranged outside the cylinder body (1), and a third passage (43) which is arranged in the cylinder wall of the cylinder (11) and is positioned on the side of the second end cover (13) and is in sealed communication with the second chamber, wherein the first passage (41), the second passage (42), the regulating valve (6) and the third passage (43) are in sealed communication.

7. A vibration absorber as claimed in claim 2, wherein:

the pressure relief device (3) is assembled on a first end cover (12) of the cylinder body (1);

the channel (4) comprises a first channel (41) which is arranged in the first end cover (12) and is in sealed communication with the pressure relief device (3), a second channel (42) which is arranged in the cylinder wall of the cylinder (11) or outside the cylinder body (1), and a third channel (43) which is arranged in the cylinder wall of the cylinder (11) and is positioned on the side of the second end cover (13) and is in sealed communication with the second chamber, wherein the first channel (41), the regulating valve (6), the second channel (42) and the third channel (43) are in sealed communication.

8. A vibration absorber according to claims 1-7, wherein: and a flow guide groove (3121) extending along the axial lead direction is arranged on the outer circumferential surface of the valve core rod part (312) of the pressure relief valve core (31).

9. A circuit breaker including the absorber of claim 1, wherein: the circuit breaker further comprises at least one single-stage switch (9), the single-stage switch (9) comprises a vacuum bulb (91), an insulating cylinder (92) and an electromagnetic driver (93), and the vacuum bulb (91), the insulating cylinder (92), the electromagnetic driver (93) and the absorber (94) are axially and fixedly connected.

10. A circuit breaker according to claim 9, wherein: insulating cylinder (92) embedded energy storage device (95), energy storage device (95) include cylinder body (951), piston (952), piston rod (953) and spring (954), cylinder body (951) are including sealed fixed top end cover (9511), cylinder (9512) and bottom end cover (9513) in proper order, piston rod (953) pass top end cover (9511) of cylinder body (951) stretch into in cylinder body (951) and with set up piston (952) in cylinder body (951) fixed mutually, set up the overflow hole on piston (952), spring (954) set up between bottom end cover (9513) and piston (952) of cylinder body (951).